U.S. patent number 10,162,211 [Application Number 15/748,870] was granted by the patent office on 2018-12-25 for display control in display devices.
This patent grant is currently assigned to Hewlett-Packard Development Company, L.P.. The grantee listed for this patent is Hewlett-Packard Development Company, L.P.. Invention is credited to Wei-Kuang Chu, Kuan-Ting Wu, Cheng-Hua Yu.
United States Patent |
10,162,211 |
Wu , et al. |
December 25, 2018 |
Display control in display devices
Abstract
The present subject matter relates to display devices. In an
example implementation, a display device comprises a display unit
having color pixels and tracks of a black matrix covering spaces
between the color pixels. The display device also comprises a
display control layer over the display unit. The display control
layer has longitudinal channels separated by transparent substrates
and overlapping the tracks of the black matrix in one direction.
The longitudinal channels comprise a first set of channels filled
with undoped bi-stable liquid crystals to control a view angle of a
display from the display unit, and a second set of channels filled
with doped bi-stable liquid crystals to control absorption of
blue/ultraviolet (UV) light from the display unit.
Inventors: |
Wu; Kuan-Ting (Taipei,
TW), Chu; Wei-Kuang (Taipei, TW), Yu;
Cheng-Hua (Taipei, TW) |
Applicant: |
Name |
City |
State |
Country |
Type |
Hewlett-Packard Development Company, L.P. |
Houston |
TX |
US |
|
|
Assignee: |
Hewlett-Packard Development
Company, L.P. (Houston, TX)
|
Family
ID: |
58631988 |
Appl.
No.: |
15/748,870 |
Filed: |
October 29, 2015 |
PCT
Filed: |
October 29, 2015 |
PCT No.: |
PCT/US2015/057927 |
371(c)(1),(2),(4) Date: |
January 30, 2018 |
PCT
Pub. No.: |
WO2017/074371 |
PCT
Pub. Date: |
May 04, 2017 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20180224693 A1 |
Aug 9, 2018 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02F
1/1343 (20130101); G02F 1/133509 (20130101); G02F
1/13338 (20130101); G02F 1/133512 (20130101); G02F
2203/62 (20130101); G02F 2201/086 (20130101) |
Current International
Class: |
G02F
1/1335 (20060101); G02F 1/1343 (20060101); G02F
1/1333 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
1020110045803 |
|
May 2011 |
|
KR |
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10-2015-0007998 |
|
Jan 2015 |
|
KR |
|
2010016843 |
|
Feb 2010 |
|
WO |
|
Other References
Gass et al., "Privacy LCD Technology for Cellular Phones," 2007,
retrieved from the internet
[http://www.sle.sharp.co.uk/sharp/apps/sle-web/research/displays_embedded-
_systems/file3.pdf], 5 pages. cited by applicant .
Internationa Searching Authority,"Search Report," issued in
connection with PCT patent application No. PCT/US2015/057927, dated
Jul. 28, 2016, 5 pages. cited by applicant .
Internationa Searching Authority,"Written Opinion," issued in
connection with PCT patent application No. PCT/US2015/057927, dated
Jul. 28, 2016, 6 pages. cited by applicant.
|
Primary Examiner: Lau; Edmond
Attorney, Agent or Firm: HPI Patent Department
Claims
We claim:
1. A display device comprising: a display unit having color pixels
and tracks of a black matrix covering spaces between the color
pixels; and a display control layer over the display unit, the
display control layer comprising longitudinal channels separated by
transparent substrates and overlapping the tracks of the black
matrix in one direction, wherein the longitudinal channels
comprise: a first set of channels filled with undoped bi-stable
liquid crystals to control a view angle of a display from the
display unit; and a second set of channels filled with doped
bi-stable liquid crystals to control absorption of blue/ultraviolet
(UV) light from the display unit.
2. The display device as claimed in claim 1, comprising a display
mode controller electrically coupled to the first set of channels
and the second set of channels, wherein in a view angle control
mode, the display mode controller is to provide a first variable
voltage across the first set of channels; in a blue/UV light
absorption mode, the display mode controller is to provide a second
variable voltage across the second set of channels; and in a view
angle control and blue/UV light absorption mode, the display mode
controller is to provide the first variable voltage across the
first set of channels and provide the second variable voltage
across the second set of channels.
3. The display device as claimed in claim 1, wherein the first set
of channels and the second set of channels are arranged such that
at least one channel of the first set of channels is followed by at
least one channel of the second set of channels.
4. The display device as claimed in claim 1, wherein the undoped
bi-stable liquid crystals comprise one of bi-stable twisted nematic
liquid crystals, smectic liquid crystals, grating aligned zenithal
bi-stable liquid crystals, and cholesteric liquid crystals.
5. The display device as claimed in claim 1, wherein the doped
bi-stable liquid crystals comprise yellow color additives, blue
light absorbers, and UV absorbers.
6. The display device as claimed in claim 1, wherein each of the
longitudinal channels has a width in a range from about 50 .mu.m to
about 100 .mu.m.
7. The display device as claimed in claim 1, wherein each of the
transparent substrates has a width in a range from about 250 .mu.m
to about 300 .mu.m.
8. The display device as claimed in claim 1, wherein each of the
longitudinal channels and each of the transparent substrates have a
height in a range from about 150 .mu.m to about 200 .mu.m.
9. A display device comprising: a display unit having color pixels
and tracks of a black matrix covering spaces between the color
pixels; and a display control layer over the display unit,
comprising: a first set of channels filled with undoped bi-stable
liquid crystals, and a second set of channels filled with doped
bi-stable liquid crystals, wherein channels of the first set and
the second set of channels are separated by transparent substrates
and overlap the tracks of the black matrix in one direction; and
transparent electrodes coupled to each channel of the first set and
the second set of channels for providing variable voltages across
the undoped bi-stable liquid crystals to control a view angle of a
display from the display unit and across the doped bi-stable liquid
crystals to control absorption of blue/ultraviolet (UV) light from
the display unit.
10. The display device as claimed in claim 9, comprising a display
mode controller electrically coupled to the transparent electrodes,
wherein in a view angle control mode, the display mode controller
is to provide a first variable voltage across the first set of
channels through respective transparent electrodes; in a blue/UV
light absorption mode, the display mode controller is to provide a
second variable voltage across the second set of channels through
respective transparent electrodes; and in a view angle control and
blue/UV light absorption mode, the display mode controller is to
provide the first variable voltage across the first set of channels
and provide the second variable voltage across the second set of
channels through respective transparent electrodes.
11. The display device as claimed in claim 9, comprising a cover
layer over the display control layer, wherein the cover layer is
one of a cover lens, a hard transparent cover, and a
touch-sensitive cover.
12. The display device as claimed in claim 9, wherein the
transparent electrodes for each channel are across a height of a
respective channel.
13. The display device as claimed in claim 9, wherein the
transparent electrodes for each channel are across a width of a
respective channel.
14. A method of controlling a display from a display device, the
display device comprising a display unit having color pixels and
tracks of a black matrix covering spaces between the color pixels,
wherein the tracks of the black matrix in one direction are covered
by a first set of channels filled with undoped bi-stable liquid
crystals and a second set of channels filled with doped bi-stable
liquid crystals, wherein channels of the first set and the second
set of channels are separated by transparent substrates, the method
comprising: receiving, by a computing device, a first user input to
operate the display device in one of a view angle control mode, a
blue/ultraviolet (UV) light absorption mode, and a view angle
control and blue/ultraviolet (UV) light absorption mode; when the
first user input is for the view angle control mode, applying, by
the computing device, a first variable voltage across the first set
of channels to control a view angle of the display from the display
device; when the first user input is for the blue/ultraviolet (UV)
light absorption mode, applying, by the computing device, a second
variable voltage across the second set of channels to control
absorption of blue/UV light from the display device; and when the
first user input is for the view angle control and blue/UV light
absorption mode, applying, by the computing device, the first
variable voltage across the first set of channels to control the
view angle of the display from the display device and the second
variable voltage across the second set of channels to control
absorption of blue/UV light from the display device.
15. The method as claimed in claim 14, comprising: in the view
angle control mode, receiving a second user input indicative of the
view angle of the display, and applying the first variable voltage
across the first set of channels depending on the second user
input; in the blue/UV light absorption mode, receiving a third user
input indicative of a degree of blue/UV light absorption, and
applying the second variable voltage across the second set of
channels depending on the third user input; and in the view angle
control and blue/UV light absorption mode, receiving a fourth user
input indicative of the view angle of the display and a fifth user
input indicative of a degree of blue/UV light absorption, and
applying the first variable voltage across the first set of
channels depending on the fourth user input and the second variable
voltage across the second set of channels depending on the fifth
user input.
Description
BACKGROUND
Electronic and communication devices, such as computers, personal
digitals assistants, mobile phone, and televisions, have a display
device for displaying contents to users. The display device of such
electronic and communication devices may include a liquid crystal
display (LCD) unit, a light emitting diode (LED) display unit, an
organic LED display unit, a polymer LED display unit, a plasma
display unit, and such.
BRIEF DESCRIPTION OF DRAWINGS
The following detailed description references the drawings,
wherein:
FIG. 1 illustrates a sectional view of a display device, according
to an example implementation of the present subject matter;
FIG. 2 illustrates a top view of the display device with a display
mode controller, according to an example implementation of the
present subject matter;
FIG. 3 illustrates a sectional view of a display device with
transparent electrodes, according to an example implementation of
the present subject matter;
FIG. 4 illustrates a sectional view of a display device with
transparent electrodes, according to an example implementation of
the present subject matter; and
FIG. 5 illustrates a method of controlling a display from a display
device, according to an example implementation of the present
subject matter.
DETAILED DESCRIPTION
Display devices may include liquid crystal display (LCD), light
emitting diode (LED), or plasma based display units for displaying
contents. Such display units have an array of color pixels that can
be selectively excited for displaying the contents. The spaces
between the color pixels in the array are covered or superimposed
by substantially opaque crosslines, referred to as tracks of a
black matrix. The tracks of the black matrix block light that may
leak out through the spaces between the color pixels, thereby
improving the contrast and sharpness of the displayed contents.
User devices, for example, desktop computers, laptops, tablets, and
smartphones, are often utilized by users for online banking, online
trading, insurance, finance, writing exams, accessing medical
records, etc. Such activities involve accessing of personal data of
users and displaying of such data on display devices associated
with the user devices. The personal data of a user, displayed on a
display device, may be sensitive to be viewed by others in the
vicinity of the display device.
The display devices generally display contents with wide view
angles. With wide view angles, personal data of users is visible
and thus can be viewed almost from all directions in front of the
display device. The wide view angles of the display device may
affect security of personal data of user. Such data may have to be
protected from prying eyes in the vicinity of the display device.
Further, the display devices may emit blue and ultraviolet (UV)
light during the display of contents. Viewing the display devices
for long durations may be harmful for the eyes of the users.
The present subject matter describes display devices and methods of
controlling displays on the display devices. The display devices
and the methods of the present subject matter facilitate
controlling of view angles of displays to protect and maintain
privacy of personal data of users from prying eyes. The display
devices and the methods of the present subject matter also
facilitate controlling of blue/UV light absorption to protect eyes
of the users from prolog viewing of the display devices.
In accordance with an example implementation of the present subject
matter, the display device includes a display control layer over a
display unit. The display unit has color pixels, with spaces
between the color pixels covered by tracks of a black matrix. The
display control layer, over the display unit, includes longitudinal
channels along, and overlapping, the tracks of the black matrix in
one direction. The longitudinal channels are separated by
transparent substrates. Further, some of the longitudinal channels
of the display control layer are filled with undoped bi-stable
liquid crystals which facilitate in controlling a view angle of a
display from the display unit. Other longitudinal channels of the
display control layer are filled with doped bi-stable liquid
crystals, with dopants that facilitate in controlling blue/UV light
absorption from the display unit. The undoped bi-stable liquid
crystals may include, but are not restricted to, cholesteric liquid
crystals and bi-stable twisted nematic liquid crystals, and such.
The dopants in the doped bi-stable liquid crystals may include, but
are not restricted to, yellow color additives, blue light
absorbers, and UV absorbers. In an example implementation, the
longitudinal channels with the undoped bi-stable liquid crystals
and the longitudinal channels with the doped bi-stable liquid
crystals may are arranged within the display control layer in any
combination.
For controlling the view angle of the display from the display
unit, a first variable voltage may be applied across the
longitudinal channels with the undoped bi-stable liquid crystals.
The first variable voltage varies the tilt of the undoped bi-stable
liquid crystals, thereby varying and controlling the degree of view
angle of the display. The view angle can be controlled to restrict
the display of the contents within a narrower angle range in front
of the user, and the contents cannot be viewed from directions
outside of the narrower angle range. For the purpose of controlling
the blue/UV light absorption from the display unit, a second
variable voltage may be applied across the longitudinal channels
with the doped bi-stable liquid crystals. The second variable
voltage varies the tilt of the doped bi-stable liquid crystals,
thereby varying and controlling the degree of blue/UV light
absorption from the display unit. Further, for the purpose of
controlling the view angle and the blue/UV light absorption
together, the first variable voltage may be applied across the
longitudinal channels with the undoped bi-stable liquid crystals
and the second variable voltage may be applied across the
longitudinal channels with the doped bi-stable liquid crystals
simultaneously.
With the display devices and the methods of the present subject
matter, the display from the display unit can be selectively
controlled for restricting the view angles of the display,
absorption of the blue/UV light from the display unit, or both.
Further, the degree of view angles and blue/UV light absorption can
be controlled, on the fly, in real-time, by varying the voltages
across the longitudinal channels. The use of bi-stable liquid
crystals in the longitudinal channels of the display control layer
helps in reducing the power consumption for controlling the
display, as the bi-stable liquid crystals preserve their state even
when the voltage across the bi-stable liquid crystals is removed.
Thus, with the display devices and the methods of the present
subject matter, the view angle of the display and the blue/UV light
absorption can be controlled in a simple and cost effective
manner.
The following detailed description refers to the accompanying
drawings. Wherever possible, the same reference numbers are used in
the drawings and the following description to refer to the same or
similar parts. While several examples are described in the
description, modifications, adaptations, and other implementations
are possible. Accordingly, the following detailed description does
not limit the disclosed examples. Instead, the proper scope of the
disclosed examples may be defined by the appended claims.
FIG. 1 illustrates a sectional view of a display device 100,
according to an example implementation of the present subject
matter. The display device 100 may be implemented in various ways.
For example, the display device 100 may be implemented as monitors
for desktop computers, and display screens of laptops, mobile
phones, tablets, electronic readers, televisions, etc. The display
device 100 includes a display unit 102 having color pixels (not
shown) and a black matrix (not shown) over the color pixels. The
black matrix is arranged over the color pixels such that tracks of
the black matrix cover spaces between the color pixels. In an
example implementation, the display unit 102 may include an LCD
unit, an LED display unit, an organic LED display unit, a polymer
LED display unit, a plasma display unit, and such.
The display device 100 also includes a display control layer 104
over the display unit 102. The display control layer 104 includes
longitudinal channels overlapping the tracks of the black matrix in
one direction. The longitudinal channels include a first set of
channels 106-1, 106-2, . . . , 106-n, and a second set of channels
108-1, 108-2, . . . , 108-n. The channels of the first set,
collectively referred to as 106, are filled with undoped bi-stable
liquid crystals. The channels of the second set, collectively
referred to as 108, are filled with doped bi-stable liquid
crystals.
The undoped bi-stable liquid crystals may include, but are not
restricted to, one of bi-stable twisted nematic liquid crystals,
smectic liquid crystals, grating aligned zenithal bi-stable liquid
crystals, and cholesteric liquid crystals. The doped bi-stable
liquid crystals has dopants which may include, but are not
restricted to, yellow color additives, blue light absorbers, and UV
absorbers. The yellow color additives may be transparent or
semi-transparent yellow color additives, such as iron oxide,
NiTiO.sub.3, lutein, cerium (IV) oxide, lead sulfochromate yellow,
lead antimonate yellow, lead-tin-antimony yellow, diarylide,
arylide, bisacetoacetarylide, benzimidazolone, and the like. The
blue light absorbers may include, but is not restricted to,
pyrophthalone. The UV absorbers may include benzophenones,
anthranilates, dibenzoylmethanes, para-aminobenzoic acid (PABA)
derivatives, salicylates, cinnamates and camphor derivatives of
size of the order of 290-400 nm.
In the display control layer 104, the longitudinal channels, i.e.,
the channels 106 and 108 of the first set and the second set, are
separated by transparent substrates 110. The transparent substrates
110 may include glass or plastic substrates that allow the light
emitted by the display unit 102 to pass through. Each of the
transparent substrates 110 may have a width in a range from about
250 .mu.m to about 300 .mu.m. Further, each of the longitudinal
channels may have a width in a range from about 50 .mu.m to about
100 .mu.m. The length of the longitudinal channels may be
substantially equal to the length of the tracks of the black
matrix. Further, each of the longitudinal channels and each of the
transparent substrates 110 may have a height in a range from about
150 .mu.m to about 200 .mu.m.
Although FIG. 1 shows the channels 106 with undoped bi-stable
liquid crystals and the channels 108 with doped bi-stable liquid
crystals being arranged alternatively; however, the channels 106
and the channels 108 can be arranged in any combination. In an
example implementation, at least one channel of the first set of
channels is followed by at least one channel of the second set of
channels. For example, two channels 106 with the undoped bi-stable
liquid crystals can be followed by two channels 108 with the doped
bi-stable liquid crystals, or two channels 106 with the undoped
bi-stable liquid crystals can be followed by one channel 108 with
the doped bi-stable liquid crystals, and vice versa.
In an example implementation, the display device 100 can be
operated in one of a view angle control mode, a blue/UV light
absorption mode, and a view angle control and blue/UV light
absorption mode. In the view angle control mode, a first variable
voltage is provided across the channels 106 with the undoped
bi-stable liquid crystals to vary the tilt of the undoped bi-stable
liquid crystals and thus control the view angle of the display from
the display unit 102. In the blue/UV light absorption mode, a
second variable voltage is provided across the channels 108 with
the doped bi-stable liquid crystals to vary the tilt of the doped
bi-stable liquid crystals and thus control the absorption of
blue/UV light from the display unit 102. In the view angle control
and blue/UV light absorption mode, the first variable voltage is
provided across the channels 106 and the second variable voltage is
provided across the channels 108 to simultaneously control the view
angle and control the absorption of blue/UV light.
FIG. 2 illustrates a top view of the display device 100 with a
display mode controller 202, according to an example implementation
of the present subject matter. As depicted in FIG. 2, the first set
of channels 106-1, . . . , 106-n and the second set of channels
108-1, . . . , 108-n are along and overlapping the tracks of the
black matrix in one direction. The tracks of the black matrix in
the other direction (referenced as 204-1, 204-2, . . . , 204-m) are
thus visible in FIG. 2.
The display mode controller 202 is electrically coupled to the
channels 106 and 108 of the first set and the second set, and is
configured to selectively operate the display device 100 in one of
the view angle control mode, the blue/UV light absorption mode, and
the view angle control and blue/UV light absorption mode. The
display mode controller 202 is electrically coupled to the channels
106 and the channels 108 through separate electrical connection
lines so that the display mode controller 202 can separately and
selectively provide voltages across the channels 106 and the
channels 108. The display mode controller 202 may be coupled to the
channels 106 through a first electrical connection line 206 and is
coupled to the channels 108 through a second electrical connection
line 208, as shown in FIG. 2.
The display mode controller 202 may operate the display device 100
in the view angle control mode by providing the first variable
voltage across the channels 106 through the first electrical
connection line 206. The display mode controller 202 may operate
the display device 100 in the blue/UV light absorption mode by
providing the second variable voltage is provided across the
channels 108 through the second electrical connection line 208.
Further, the display mode controller 202 may operate the display
device 100 in the view angle control and blue/UV light absorption
mode by providing the first variable voltage across the channels
106 and the second variable voltage across the channels 108 through
the respective electrical connection lines 206 and 208.
In an example implementation, the display mode controller 202 may
receive a user input, referred to as a first user input, indicative
of the view angle control mode, or the blue/UV light absorption
mode, or the view angle control and blue/UV light absorption mode,
as selected by a user. The display mode controller 202 may provide
voltages across the channels 106 and/or 108 dependent on the mode
selected by the user.
In an example implementation, while operating in the view angle
control mode, the display mode controller 202 may receive a user
input, referred to as a second user input, indicative of a specific
view angle of the display. In an example, the second user input may
be to restrict the view angle to .+-.10.degree., .+-.20.degree., or
any other angle about a perpendicular on a plane of the display
device 100. The display mode controller 202 may apply the first
variable voltage across the channels 106 depending on the view
angle indicated by the second user input.
Further, in an example implementation, while operating in the
blue/UV light absorption mode, the display mode controller 202 may
receive a user input, referred to as a third user input, indicative
of a specific degree of blue/UV light absorption from the display.
In an example, the third user input may be to absorb blue/UV light
by 10%, 20%, or any other percentage value. The display mode
controller 202 may apply the second variable voltage across the
channels 108 depending on the degree of blue/UV light absorption
indicated by the third user input.
Further, in an example implementation, while operating in the view
angle control and blue/UV light absorption mode, the display mode
controller 202 may receive a user input, referred to as a fourth
user input, indicative of a specific view angle of the display, and
receive another user input, referred to as a fifth user input,
indicative of a specific degree of blue/UV light absorption from
the display. The display mode controller 202 may apply the first
variable voltage across the channels 106 and apply the second
variable voltage across the channels 108 depending on the fourth
user input and the fifth user input, respectively.
In an example implementation, the display mode controller 202,
amongst other things, may include routines, programs, objects,
components, data structures, and the like, which perform particular
tasks or implement particular abstract data types. The display mode
controller 202 may be coupled to, and executed by, a processor (not
shown) to perform various functions for the purposes of operating
the display device 100 in one of the view angle control mode, the
blue/UV light absorption mode, and the view angle control and
blue/UV light absorption mode, in accordance with the present
subject matter. In an example implementation, the processor may be
implemented as microprocessors, microcomputers, microcontrollers,
digital signal processors, central processing units, state
machines, logic circuitries, and/or any devices that manipulate
signals based on operational instructions. Among other
capabilities, the processor may fetch and execute computer-readable
instructions stored in a memory coupled to the processor. The
memory may be a memory of the display mode controller 202, and may
include any non-transitory computer-readable storage medium
including, for example, volatile memory (e.g., RAM), and/or
non-volatile memory (e.g., EPROM, flash memory, NVRAM, memristor,
etc.). The functions of the display mode controller 202 may be
provided through the use of dedicated hardware as well as hardware
capable of executing computer-readable instructions.
In an example implementation, the display control layer 104
includes transparent electrodes coupled to each of the channels 106
and 108 for providing variable voltages across the undoped
bi-stable liquid crystals and the doped bi-stable liquid crystals.
The transparent electrodes may be in the form of nanowires or a
mesh of materials including, but not restricted to, indium tin
oxide, silver, poly(3,4-ethylenedioxythiophene) polystyrene
sulfonate (PEDOT:PSS), or a combination thereof. In an example
implementation, the transparent electrodes can be nanotubes of
carbon, graphene, PEDOT:PSS or a combination thereof.
The first electrical connection line 206 from the display mode
controller 202 is electrically coupled with the channels 106
through the respective transparent electrodes, and the second
electrical connection line 208 from the display mode controller 202
is electrically coupled with the channels 108 through the
respective transparent electrodes.
FIG. 3 illustrates a sectional view of a display device 300 with
transparent electrodes, according to an example implementation of
the present subject matter. The display device 300 has a monolithic
structure. As shown in FIG. 3, the display device 300 includes an
upper electrodes layer 302 and a lower electrodes layer 304 across
the display control layer 104, such that the transparent electrodes
(e.g. 306 and 308) for each of the channels 106 and 108 are across
a height of the respective channel above the display unit 102. The
regions (e.g. 310 and 312) between the transparent electrodes in
the upper electrodes layer 302 and the lower electrodes layer 304
are filled with electrically insulating and optically transparent
material, such as polyacrylic, polycarbonate and cyclic olefin
copolymer (COC) polymers. Further, the display device 300 includes
a cover layer 314 over the display control layer 104. In an example
implementation, the cover layer 314 is one of a cover lens, a hard
transparent cover, and a touch-sensitive cover.
In an example implementation, the display control layer 104 of the
display device 300 may function in a twisted nematic mode. In the
display device 300, the view angle of the display can be varied
from .+-.90.degree. to 0.degree. about the perpendicular from the
plane of the display device 300 by providing the first variable
voltage from 0 V to a first predefined voltage across the channels
106. The first predefined voltage may, for example, be 1.8 V, 3.3
V, or 5 V depending on a driving voltage associated with the
display mode controller 202. By varying the voltage from 0 V to the
first predefined voltage across the channels 106 in the display
device 300, the undoped bi-stable liquid crystals in the channels
106 tilt from 0% to 100%, thereby varying the view angle of the
display from .+-.90.degree. to 0.degree. about the perpendicular
from the plane.
Similarly, in the display device 300, the degree of blue/UV light
absorption can be varied from 0% to 100% by providing the second
variable voltage from 0 V to a second predefined voltage across the
channels 108. The second predefined voltage may, for example, be
1.8 V, 3.3 V, or 5 V depending on a driving voltage associated with
the display mode controller 202. By varying the voltage from 0 V to
the second predefined voltage across the channels 108 in the
display device 300, the doped bi-stable liquid crystals in the
channels 108 tilt from 0% to 100%, thereby varying the degree of
blue/UV light absorption from 0% to 100%.
FIG. 4 illustrates a sectional view of a display device 400 with
transparent electrodes, according to an example implementation of
the present subject matter. The display device 400 has a monolithic
structure. The display device 400 includes a layer of electrodes
402 on one side of the display control layer 104, such that the
transparent electrodes (e.g. 404 and 406) for each of the channels
106 and 108 are across a width of the respective channel. The
regions (e.g. 408) between the transparent electrodes in the layer
of electrodes 402 are filled with electrically insulating and
optically transparent material, such as polyacrylic, polycarbonate
and cyclic olefin copolymer (COC) polymers. Further, the display
device 400 includes a cover layer 410 over the display control
layer 104. In an example implementation, the cover layer 410 may,
for example, be a cover lens, a hard transparent cover, or a
touch-sensitive cover.
In an example implementation, the display control layer 104 of the
display device 400 may function in an in-plane switching mode. In
the display device 400, the view angle of the display can be varied
from .+-.90.degree. to 0.degree. about the perpendicular from the
plane of the display device 400 by providing the first variable
voltage from a first predefined voltage to 0 V across the channels
106.
The first predefined voltage may, for example, be 1.8 V, 3.3 V, or
5 V depending on a driving voltage associated with the display mode
controller 202. By varying the voltage from the first predefined
voltage to 0 V across the channels 106 in the display device 400,
the undoped bi-stable liquid crystals in the channels 106 tilt from
0% to 100%, thereby varying the view angle of the display from
.+-.90.degree. to 0.degree. about the perpendicular from the
plane.
Similarly, in the display device 400, the degree of blue/UV light
absorption can be varied from 0% to 100% by providing the second
variable voltage from a second predefined voltage to 0 V across the
channels 108. The second predefined voltage value may, for example,
be 1.8 V, 3.3 V, or 5 V depending on a driving voltage associated
with the display mode controller 202. By varying the voltage from
the second predefined voltage to 0 V across the channels 108 in the
display device 400, the doped bi-stable liquid crystals in the
channels 108 tilt from 0% to 100%, thereby varying the degree of
blue/UV light absorption from 0% to 100%.
FIG. 5 illustrates a method 500 of controlling a display from a
display device 100, according to an example implementation of the
present subject matter. The method 500 can be implemented by
processor(s) or computing device(s) through any suitable hardware,
a non-transitory machine readable medium, or combination thereof.
Further, although the method 500 is described in context of the
aforementioned display mode controller 202 coupled to the display
device 100, other suitable computing devices or systems may be used
for execution of the method 500. It may be understood that
processes involved in the method 500 can be executed based on
instructions stored in a non-transitory computer readable medium,
as will be readily understood. The non-transitory computer readable
medium may include, for example, digital memories, magnetic storage
media, such as a magnetic disks and magnetic tapes, hard drives, or
optically readable digital data storage media.
Referring to FIG. 5, at block 502, a first user input is received
by the display mode controller 202 to operate the display device
100 in one of a view angle control mode, a blue/ultraviolet (UV)
light absorption mode, and a view angle control and
blue/ultraviolet (UV) light absorption mode. A user may provide the
first user input directly, or through a user interface to the
display mode controller 202.
At block 504, a first variable voltage is applied across the first
set of channels by the display mode controller 202 to control a
view angle of the display from the display device 100 when the
first user input is for the view angle control mode. At block 506,
a second variable voltage is applied across the second set of
channels by the display mode controller 202 to control absorption
of blue/UV light from the display device 100 when the first user
input is for the blue/ultraviolet (UV) light absorption mode.
Further, at block 508, the first variable voltage is applied across
the first set of channels by the display mode controller 202 to
control the view angle of the display from the display device 100
and the second variable voltage is applied across the second set of
channels by the display mode controller 202 to control absorption
of blue/UV light from the display device 100 when the first user
input is for the view angle control and blue/UV light absorption
mode.
In an example implementation, in the view angle control mode, a
second user input indicative of the view angle of the display may
be received by the display mode controller 202, and the first
variable voltage is applied across the first set of channels
depending on the second user input. Further, in the blue/UV light
absorption mode, a third user input indicative of a degree of
blue/UV light absorption may be received by the display mode
controller 202, and the second variable voltage is applied across
the second set of channels depending on the third user input.
Further, in the view angle control and blue/UV light absorption
mode, a fourth user input indicative of the view angle of the
display and a fifth user input indicative of a degree of blue/UV
light absorption may be received by the display mode controller
202, and the first variable voltage is applied across the first set
of channels depending on the fourth user input and the second
variable voltage is applied across the second set of channels
depending on the fifth user input.
In an example implementation, the method 500 may be implemented
through a set of computer readable instructions in a non-transitory
computer readable medium for controlling the display from the
display device 100. The set of computer readable instructions can
be accessed by a computer and subsequently executed to perform acts
for controlling the display from the display device 100.
Although implementations for display devices and methods of
controlling displays from the display devices have been described
in language specific to structural features and/or methods, it is
to be understood that the present subject matter is not limited to
the specific features or methods described. Rather, the specific
features and methods are disclosed and explained as example
implementations for display devices and methods of controlling
displays from the display devices.
* * * * *
References